The brand new example we included in lecture involves the extensor digitorum longus (EDL), a strength and this crosses the fresh foot, subtalar mutual (STJ), and you can, in reality, most of the mutual of up to the Dip mutual.
To indicate a natural illustration of probably the most unfathomable and you will destructive collaboration of information is the conceptual thought of person dating
The latest EDL have a tendency to act for each of these bones, dorsiflexing the fresh new foot, pronating the subtalar combined, up coming extending the new MP, PIP, and you can Dip bones.
not, whenever we use the EDL in itself, it will likewise flow the newest ankle, STJ, etc. Whenever we need to continue brand new leg within Dip combined rather than move some other combined, we have to stimulate other muscle mass, an excellent synergist, along with the EDL.
This synergist will be stop the EDL at both the ankle and you may STJ. Because the EDL dorsiflexes the fresh new ankle and pronates this new STJ, the fresh syngergist would be to plantar fold this new foot and you may supinate new STJ. A muscle and therefore does this ‘s the tibialis posterior. Ergo, the new EDL and also the tibialis rear operate in a genuine collaboration to increase the fresh Dip bones versus swinging this new foot and you can STJ.
(Remember that the flexor digitorum longus plus plantar flexes the new foot, and supinates the fresh STJ. It would maybe not benefit this, yet not, since it and crosses the brand new PIP and you can Drop bones. In fact, it would be a keen antagonist on the EDL.)
ANTAGONISTS
Muscles that have contrary actions at the a combined are antagonists. Seen within the a specific plane of movement, brand new human body whoever lines out of app take reverse sides regarding a joint axis try antagonists.
We should not consider human body as actually prepared inside agonist-antagonist pairs. I would not see it beneficial, for example, to try and identity an enthusiastic antagonist for every strength. As an alternative, considering a functional course, you want to remember looks regarding functional communities which possess opposite measures.
Antagonists generally relax when agonist acts. Cocontraction or, to use an expression I love, coactivation, happens when looks into both sides away from a joint axis was productive. We quite often coactivate system when we would unlearned otherwise book actions. I also coactivate looks as soon as we create enabling or true synergies.
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